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SUMMARY:Tim Cohen (University of Oregon)
DTSTART:20201009T170000Z
DTEND:20201009T180000Z
DTSTAMP:20260423T022810Z
UID:CMU-TP/11
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CMU-TP/11/">
 Soft de Sitter Effective Theory</a>\nby Tim Cohen (University of Oregon) a
 s part of Carnegie Mellon theoretical physics\n\n\nAbstract\nIn this talk\
 , I will introduce the Soft de Sitter Effective Theory (SdSET)\, whose pur
 pose is to model the long wavelength dynamics of quantum fluctuations beyo
 nd the horizon.  After providing some conceptual and technical issues that
  motivate the need for a new EFT approach\, I will explain how we identify
  the propagating low energy degrees of freedom\, along with their scaling 
 under a power counting scheme and their transformation properties under th
 e symmetries that persist to the IR.  I will sketch how to derive the SdSE
 T action\, and will argue that it can be expressed as an expansion in loca
 l operators\, augmented by stochastic initial conditions.  Finally\, I wil
 l show how this framework can be applied to a number of physically interes
 ting problems: massive scalar fields in dS\, light scalar fields and stoch
 astic inflation\, conservation of the inflationary adiabatic modes\, and t
 he phase transition to eternal inflation.\n
LOCATION:https://researchseminars.org/talk/CMU-TP/11/
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